Olin, Oscar Eugene. Akron and Environs Historical Biographical Genealogical. Chicago: Lewis Publishing, 1917.
The Olive Branch, or, Herald of Peace and Truth to All Saints. Kirtland, OH, 1848–1849; Springfield, IL, 1849–1850; Kirtland, OH, 1850–1852.
Olney, James H. A Genealogy of the Descendants of Thomas Olney, an Original Proprietor of Providence, R. I., Who Came from England in 1635. Providence, RI: By the author, 1889.
Olney, Oliver H. Spiritual Wifery at Nauvoo Exposed; Also a True Account of Transactions in and about Nauvoo. St. Louis: By the author, 1845.
Olney, Oliver H. The Absurdities of Mormonism Portrayed. Hancock Co., IL: By the author, 1843.
Olsen, Steven L. “The Mormon Ideology of Place: Cosmic Symbolism of the City of Zion, 1830–1846.” PhD diss., University of Chicago, 1985. Also available as The Mormon Ideology of Place: Cosmic Symbolism of the City of Zion, 1830–1846, Dissertations in Latter-day Saint History (Provo, UT: Joseph Fielding Smith Institute for Latter-day Saint History; BYU Studies, 2002).
Olson, Ferron A. Seymour Brunson: Defender of the Faith. Salt Lake City: By the author, 1998.
Olson, Joseph William. “History of Erastus Snow.” Master’s thesis, Brigham Young University, 1935.
Ontario Phoenix. Canandaigua, NY. 1828–1832.
Oquawka Spectator. Oquawka, IL. 1848–1908.
Oration Delivered by Mr. S. Rigdon, on the 4th of July, 1838. Far West, MO: Journal Office, 1838. Also available in Peter Crawley, “Two Rare Missouri Documents,” BYU Studies 14 (Summer 1974): 502–527.
“The Original Prophet. By a Visitor to Salt Lake City.” Fraser’s Magazine 7, no. 28 (Feb. 1873): 225–235.
Orth, Samuel P. A History of Cleveland Ohio. Vol. 1. Chicago: S. J. Clarke, 1910.
Orton, Edward. An Account of the Descendants of Thomas Orton of Windsor, Connecticut, 1641. Columbus, OH: Nitschke Brothers, 1896.
Ostertag, John A., and Enid Ostertag. Illustrated Doniphan County, 1837–1916: Supplement to The Weekly Kansas Chief, Troy, Kansas, April 6, 1916. Troy, KS: Trojan Graphics, 1999.
Oswego Palladium. Oswego, NY. 1832–1852.
Our Documents.gov. http://www.ourdocuments.gov/.
Overton, Julie Minot. Ohio Towns and Townships to 1900: A Location Guide. Edited by Kay Ballantyne Hudson and Sunda Anderson Peters. Mansfield, OH: Ohio Genealogical Society, 2000.
Owen, E. A. Pioneer Sketches of Long Point Settlement, or Norfolk's Foundation Builders and Their Family Genealogies. Toronto: William Briggs, 1898.
The Oxford Dictionary of the Christian Church. Edited by F. L. Cross and E. A. Livingstone. 3rd ed. New York: Oxford University Press, 1997.